Degussa Aktiengesellschaft

Markus Hornfeck

Helmut Mangold

Klaus Deller

Monika Oswald

Rolf Clasen

Gerrit Schneider

A layer which is obtained by thermal treatment from an aqueous dispersion applied to a substrate, the dispersion containing silicon/titanium mixed oxide powder prepared by flame hydrolysis. It is prepared by applying a dispersion which contains the silicon/titanium mixed oxide powder to a substrate and then sintering by using a thermal treatment. It can be used, for example, on materials with very low coefficients of expansion.

Layer obtained from an aqueous dispersion containing a silicon/titanium mixed oxide powder prepared by flame-hydrolysis

Aqueous dispersion comprising silicon/titanium mixed oxide powder with a BET surface area of 5 to 500 m/g which has been prepared by flame hydrolysis and has a titanium dioxide content of 0.5 to 20 wt. %, based on the powder, water and at least one pH-regulating substance which can be removed completely from the reaction mixture on heating, the aqueous dispersion having a solids content of between 40 and 80 wt. %. A green body produced therefrom with a green density of between 40 and 85%. A shaped glass article of optical quality with a coefficient of thermal expansion of not more than 0.5&#xd7;10/K produced from the green body.

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Blieskastel, Germany

Markus Hornfeck